Development of a Polymer-Based Flexible Sensor Sheet Using Electric Capacitance (A New Structure Achieving Both High Precision and High Resolution)

概要

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Traditional capacitance sensor sheets usually have a three-layered structure, with a dielectric layer sandwiched by two electrode layers. Each electrode layer has a number of parallel ribbon-like electrodes. The electrodes on the two electrode layers are oriented orthogonally and each crossing area of two crossing electrodes makes up a capacitance sensor cell on the sheet. It is well known that compatibility between measuring precision and resolution is difficult since decreasing the width of the electrodes is inevitable to obtain a high resolution, however, this may lead to reduction of the area of the sensor cells, and as a result, lead to a low S/N ratio. To overcome this problem, a new multilayered structure and related signal processing approach were proposed. This new structure stacks two or more sensor sheets with shifts in position. Both a high precision and a high resolution can be obtained by combining the signals of the stacked sensor sheets. Trial production was made and the effect was confirmed.